[745] For the minute structure of the dental organs, the modes of dentition prevalent in the mammalia, and the homologies of the teeth, we must refer to Prof. Owen’s often-quoted works, the matchless Odontography, and the lucid and compendious Article on Teeth, in the Cyclopædia of Anatomy and Physiology.
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Lign. 258. Tooth of Mastodon elephantoides: 1/6 nat. size. Upper Tertiary. Ava, Burmah. |
Lign. 259. Tooth of Elephas primigenius: 1/6 nat. size. Upper Tertiary. Big-bone-lick. N. America. |
Lign. 260. Teeth of Elephants: 1/6 nat. size.
The grinding surfaces of the teeth exhibit the arrangement of the bands of enamel, which have an analogous, but somewhat different distribution in the teeth of the different species of Elephant.
| Fig. | 1.— | The worn surface of a molar tooth of the African Elephant. |
| 2.— | That of the Fossil Elephant or Mammoth (Elephas primigenius). | |
| 3.— | That of the Asiatic Elephant. |
HIPPOPOTAMUS.
